River Variability and Complexity
Rivers differ among themselves and through time. An individual river can vary significantly downstream, changing its dimensions and pattern dramatically over a short distance. If hydrology and hydraulics were the primary controls on the morphology and behaviour of large rivers, we would expect long reaches of rivers to maintain characteristic and relatively uniform morphologies. In fact, this is not the case - the variability of large rivers indicates that other important factors are involved. River Variability and Complexity presents an interesting approach to the understanding of river variability. It provides examples of river variability and explains the reasons for them, including fluvial response to human activities. Understanding the mechanisms of variability is important for geomorphologists, geologists, river engineers and sedimentologists as they attempt to interpret ancient fluvial deposits or anticipate river behaviour at different locations and through time. This book provides an excellent background for graduates, researchers and professionals.
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abandoned active adjust aggradation alluvial fans alluvial rivers alluvium anabranch anastomosing avulsion bank erosion bankfull bars base-level change bedload bedrock braided channel braided rivers braided stream cause chan channel changes channel Figure channel gradient channel incision channel pattern channel width Chapter Chippewa River climate controls convexity Creek decrease degradation delta deposition depth downstream drainage basin earthquakes effect Euphrates example feet floodplain Galay geologic geomorphic Grand Island gravel Harappan hydrologic impact incised channel increase Indus River Lake landslide main channel major meandering meandering channel Missouri River Mohen jo Daro narrow navigation Nejef nickpoint Nile Niobrara River no-flow days occur plain Platte River regime relatively result Rio Puerco River Figure 1.3 river mile river morphology sand Schumm sediment load shift significantly sinuosity sinuous channel stability steeper straight Table Tallahala Creek tectonic tributary uplift upstream valley floor valley slope variability vegetation widening width--depth ratio Winkley